Olivier Hubert

Project description

Structural composite batteries can be used in applications such as car chassis, where they act as both energy source and storage and structural component. The aim of this PhD is first to manufacture structural lithium ion batteries via continuous intermingling of carbon fibres electrodes. To gain a better understanding of the spreading process of the carbon fibres, a secondment of three months is planned at NTPT (Switzerland). The next step is to establish a proof-of-concept that intermingled carbon fibres electrodes are a viable route to producing large scale structural composite batteries and to improve the performance of the proof-of-concept structural composite batteries. Another secondment of four months is planned at KU Leuven (Belgium) to mechanically and structurally characterize structural batteries.

Education

PhD candidate at University of Vienna (2018 – present)
M.Eng. in Bio-engineering and Nanotechnologies, École Centrale de Lyon (France)
M.Sc in Nanoscience and Nanotechnologies, Université de Lyon (France) 

Research interests

Lithium-ion batteries, composite materials, nanoscale fabrication, analytical chemistry, multifunctional materials

Personal note

If a hobby is just something you enjoy doing, then for me it would be sharing good moments with friends around a beer or a coffee. During week-ends and holidays I enjoy travelling. For this living in Vienna is perfect as it is in the centre of Europe. My favourite destination is China, I travelled there several times and still feel like there is so much more to discover.

Latest publications by this author

Improving the performance of pseudo-ductile hybrid composites by film-interleaving [OPEN ACCESS]

Salvatore GiacomoMarino, GergelyCzél

Improvement of the interfacial fracture toughness of the layer interfaces is one way to increase the performance of interlayer hybrid laminates containing standard thickness carbon/epoxy plies and make them fail in a stable, progressive way. The layer interfaces were interleaved with thermoset 913 type epoxy or thermoplastic acrylonitrile–butadienestyrene (ABS) films to introduce beneficial energy absorption mechanisms and promote the fragmentation of the relatively thick carbon layer under tensile loads. Carbon layer fragmentation and dispersed delamination around the carbon layer fractures characterised the damage modes of the epoxy film interleaved hybrid laminates, which showed pseudo-ductility in some cases. In the ABS film interleaved laminates, a unique phase-separated ABS/epoxy inter-locking structure was discovered at the boundary of the two resin systems, which resulted in a strong adhesion between the fibre-reinforced and the thermoplastic layers. As a result, the delamination cracks were contained within the ABS interleaf films.

Effect of Plasma-Treatment of Interleaved Thermoplastic Films on Delamination in Interlayer Fibre Hybrid Composite Laminates [OPEN ACCESS]

Salvatore Giacomo Marino, Florian Mayer, Alexander Bismarck and Gergely Czél

Safe, light, and high-performance engineering structures may be generated by adopting composite materials with stable damage process (i.e., without catastrophic delamination). Interlayer hybrid composites may fail stably by suppressing catastrophic interlayer delamination. This paper provides a detailed analysis of delamination occurring in poly(acrylonitrile-butadiene-styrene) (ABS) or polystyrene (PS) film interleaved carbon-glass/epoxy hybrid composites. The ABS films toughened the interfaces of the hybrid laminates, generating materials with higher mode II interlaminar fracture toughness (GIIC), delamination stress (σdel), and eliminating the stress drops observed in the reference baseline material, i.e., without interleaf films, during tensile tests. Furthermore, stable behaviour was achieved by treating the ABS films in oxygen plasma. The mechanical performance (GIIC and σdel) of hybrid composites containing PS films, were initially reduced but increased after oxygen plasma treatment. The plasma treatment introduced O-C=O and O-C-O-O functional groups on the PS surfaces, enabling better epoxy/PS interactions. Microscopy analysis provided evidence of the toughening mechanisms, i.e., crack deflection, leading plasma-treated PS to stabilise delamination.

Understanding the mechanical response of glass and carbon fibres: stress-strain analysis and modulus determination

Rajnish Kumar, Lars P Mikkelsen, Hans Lilholt and Bo Madsen

Accurate characterization of fibres is crucial for the understanding the properties and behaviour of fibre-reinforced composite materials. Fibre properties are key parameters for composite design, modelling and analysis. In this study, characterization of mechanical properties of glass and carbon fibres has been performed using a semi-automated single-fibre testing machine. Based on a sample set of 150 glass and carbon fibers fibres, engineering and true stress-strain curves are analyzed. Different modulus determination methods are discussed based on true stress-strain and tangent modulus-strain relationships. For glass fibres, the true stress-strain based tangent modulus is found to be independent of applied strain, whereas for carbon fibres, a tendency of tangent modulus to increase with applied strain is observed. The modulus of glass fibres is found to be independent of fibre diameter, whereas carbon fibres with smaller diameter show higher modulus compared with carbon fibres with larger diameters.